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      Effect of Cu addition on porous NiTi SMAs produced by self-propagating high-temperature synthesis

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          Abstract

          The focus of the study is on the effect of copper addition on the porosity, microstructure and mechanical properties of hot pressed NiTi and NiTiCu shape memory alloys (SMAs), ignited by means of self-propagating high-temperature synthesis (SHS). Optical microscopy, scanning electron microscopy (SEM), X-ray diffraction (XRD), energy dispersive spectrometry (EDS), hardness tests and compression tests were applied respectively to determine the microstructure and mechanical behavior of the samples. The experimental results show that the addition of Cu into NiTi SMAs increases porosity and microhardness but also reduces compressive strength.

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          Most cited references22

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          Cytotoxicity, genotoxicity, and metal release in patients with fixed orthodontic appliances: a longitudinal in-vivo study.

          Treatment with fixed orthodontic appliances in the corrosive environment of the oral cavity warrants in-vivo investigations of biocompatibility. Eighteen control and 28 treated subjects were evaluated longitudinally. Four combinations of brackets and archwires were tested. Buccal mucosa cell samples were collected before treatment, and 3 and 6 months after appliance placement. The cells were processed for cytotoxicity, genotoxicity, and nickel and chromium contents. In the treatment group, buccal mucosa cell viability values were 8.1% at pretreatment, and 6.4% and 4.5% at 3 and 6 months, respectively. The composite score, a calculated DNA damage value, decreased from 125.6 to 98.8 at 6 months. Nickel cellular content increased from 0.52 to 0.68 and 0.78 ng per milliliter, and chromium increased from 0.31 to 0.41 and 0.78 ng per milliliter at 3 and 6 months, respectively. Compared with the control group, the treated subjects showed significant differences for DNA damage and chromium content at 3 months only. Fixed orthodontic appliances decreased cellular viability, induced DNA damage, and increased the nickel and chromium contents of the buccal mucosa cells. Compared to the control group, these changes were not evident at 6 months, possibly indicating tolerance for or repair of the cells and the DNA. Copyright © 2011 American Association of Orthodontists. Published by Mosby, Inc. All rights reserved.
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            Compression behavior of porous NiTi shape memory alloy

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              Self-propagating high-temperature (combustion) synthesis (SHS) of powder-compacted materials

              J Moore, H. Yi (1990)
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                Author and article information

                Journal
                mp
                Materials Testing
                Carl Hanser Verlag
                0025-5300
                2195-8572
                02 December 2019
                : 61
                : 12
                : 1140-1144
                Affiliations
                1 Batman
                2 Bingol, Turkey
                Author notes
                [* ] Correspondence Address, Associate Prof. Dr. İhsan Kirik, Department of Metallurgy and Materials Engineering, Bingol University, Bingol, Turkey, E-mail: musa.kilic@ 123456batman.edu.tr , burak.yenigum@ 123456batman.edu.tr , serkan.batı@ 123456batman.edu.tr , alihsankirik@ 123456gmail.com , zbalaln@ 123456bingol.edu.tr

                Assistant Prof. Dr. Musa Kılıç, born 1975, received his BSc degree in the Technical Education Faculty at Firat University, Turkey, in 2005. He then received his MSc degree in the Department of Metallurgy in 2007. In 2008 he began studying for his Doctorate degree in the same field and completed the requirements in 2014. Currently, he is an Assistant Professor at Batman University.

                Assistant Prof. Dr. Burak Yenigun, born 1988, graduated from Harran University, Department of Mechanical Engineering. In September 2010, he took up postgraduate work and became a Project Assistant in the same department. In December 2011, he started working as a Research Assistant at the same department. In November 2012, he became a Research Assistant in the Department of Mechanical Engineering at Batman University. He completed his Master's thesis in January 2013. In January 2018, he completed his PhD. Currently, he is an Assistant Professor at Batman University.

                Sekan Batı, born 1988, is a Research Assistant in the Mechanical and Manufacturing Engineering at Batman University where he has been a faculty member since November 2013. Serkan completed his MSc study at Batman University and his undergraduate study in the Mechanical Engineering Department at Gaziantep University. He is currently continuing his PhD studies at Batman University. His research interests lies in the area of powder metallurgy, welding technologies and composite materials.

                Assistant Prof. Dr. Zulkuf Balalan received his BSc degree in the Technical Education Faculty at Firat University, Elazıg, Turkey in 1996. He received his MSc degree in the Metallurgy Education Department in 2004. He received his PhD degree in the same department in 2013. Currently, he is an Assistant Professor at Bingol University in Turkey.

                Associate Prof. Dr. Ihsan Kirik received his BSc degree in the Technical Education Faculty at Firat University, Elazıg, Turkey in 2005. He received his PhD degree in the Metallurgy Education Department at Fırat University in 2012. Currently, he has been researching solid state welding processes and coating of steels as an Associate Professor at Bingol University in Turkey.

                Article
                MP111439
                10.3139/120.111439
                6de83471-9c1e-4e01-bd86-e46628a30c84
                © 2019, Carl Hanser Verlag, München
                History
                Page count
                References: 22, Pages: 5
                Categories
                Fachbeiträge/Technical Contributions

                Materials technology,Materials characterization,Materials science
                Materials technology, Materials characterization, Materials science

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